Fuse for electrical circuits.



S. M. KIN'TNER & G. B. ROSENBLATT.

FUSE FOE ELECTRICAL CIRCUITS. APPLICATION FILED NOV, 4, 1905.

Patented May 31, 1910.

QNENTORS ATTORNEY UNITED STA-Tris 'PATENT QF IOE; j

SAMUEL u. KINTNER, or PIT'rsBURG, PENNSYLVANIA, ANI'D GIRARD B, RosENBLA'r'r, or NEW YORK, N. YJASSIGNORS TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION or PENNSYLVANIA.

FUSE FOR ELECTRICAL CIRCUITS.

tively, of Pittsburg, in the county of Alle-.

heny and State of Pennsylvania, and of ew'York, in the county of'New York' and State of New York, have invented a new and I An insulating tube 1 is provided with end useful Improvement in Fuses for Electrical Circuits, of which the following is a speci fication.

Our invention relates provide a novel and improved fuse device that shall be especially adapted to the protection of high potential circuits.

. Our invention is illustrated in the accompanying drawing, Figure 1 of. which is a "View; partially in section and partially in tion, of the device shown in'Fig. 1, and Fig. 3 is a view in section on line III-III of.

Fig. 1.

caps or terminal pieces 2 and 3, to the inner and opposing faces of which a fusible conductor 4 is soldered or otherwise suitably secured in such a manner that it is suspended out of contact with the tube 1. The conductor 4 may be further supported by'means of a strip 5 of insulating material, such as mica, the width of which is approximately equalto or is slightly greater than the diameter of the insulating tube 1 whereby it is secured in position, or an additional support of other suitable character may be emplo ed.- The end caps 2 and 3 are provided wit flattened .projections 6 and 7 that are adapted to be engaged by suitable jaws orsplit terminal pieces 8 and 9, respectively, the tube 1 being thereby supported in position. The upper edges of the flattened portions 6 and 7 are'flared or they may be otherwise suitably enlarged or arranged ,so as to prevent placing of the fuse device in position in the jaws except in such a manner as to insure supporting of the conductor 4 by the strip 5. The terminal pieces 8 and 9 extend through an inclosing casing 10 and are supported in position and insulated therefrom by means of bushings 11 and 12, circuit conductors 13 and 14; beingsoldered or otherwise Specif cation of Letters Patent.

to fuses for elec .trical circuits, and it has for its object to Patented May 31, 1910.

Application filed November 4, 1905. Serial No. 285,342; g

suitably secured to the extensions or lower with any suitable insulating fluid, such as 011, wherein the parts just described are immersed.

Under normal operating conditions, the insulating tube -1 maintains the insulating fluid out of contact with the fusible conductor t and the insulating support 5 serves to prevent the conductor 4 from sagging when it becomes heated to a degree less than that at which it fuses. Upon continuance of more than a predetermined amount of ourcauses destruction of the insulating tube'l, thereby permitting the insulating fluid to occupy the space thus left vacant and to extinguish any are that might exist between the terminal pieces 2 and 3 after fusing of the conductor. Since the pressure of the oil and currents set up therein by the destruction of the tube insures extinguishment of the arc, it is evident that the device is particularly adapted to-the protection of high potential circuits.

The oil is maintained out of contact with the conductor because it may become sufiiciently heated to vaporize'the oil when opto disintegrate it inf'such a manner as to form heavy deposits of foreign material on its surface and therefore bring about, in a short time, changes which would alter the current value at which the device would opcrate. The insulating tube may be composed of glass or any other suitable insulating maplosion or fusing of the conductor.

is provided with a moisture proof cover, the device may be placed where it is likely to be rane'an systems of distribution.

the inclosure within the insulating tube, or the inclosure may be filled with any suite A locally weakened portion 15 may also be provided in the insulating tube, which may be the only portion that is destroyed or which may be the first destroyed upon the fusing of'the conductor, and this weakened portion may be so located as to direct the ends thereof. The inclosing casing 10 is filletl rent in the circuit which the device is adapted to protect, the conductor 4 fuses and crating under normal conditions or, at least,

If desired, the air may be exhausted from terial which will be destroyed by the ex- If the receptacle for the insulating fluid submerged, as in the manholes of subter-' able inert gas, or withanexplosive mixture.

flow of insulating fluid upon any desired portion of the conductor.

The structural details of our invention may obviously be modified within Wide.

limits without departing from its spirit and We desire that all such modifications be included within its scope We claim as our invention:

1. A fuse for electrical circuits comprising a sealed insulating tube of frangible material and a fusible conductor suspended therein, in combination with means for making circuit connections to the terminals of the fusible conductor, a receptacle filled with insulating liquid in which the insulating tube is immersed, and an insulating strip v located Within the tube and supporting the fusible conductor throughout its length.

2. A fuse for electrical circuits comprising a sealed insulating tube, a fusible con-.

ductor suspended therein, and means within the tube for supporting the conductor from end to end throughout its length, in eombination with means for making circuit connections to the terminals-of the fusible conductor, and a receptacle containing insulat-' ing fluid in which the insulating tube is imits length, and a receptacle filled with an insulating liquid in which the said parts are immersed and provided with circuit terminals that engage the end caps and support the tube.

4. A fuse for electrical circuits comprising an insulating tube, conducting end caps therefor, a fusible conductor suspended Within the tube between thecnd caps, an insulating support upon which the fusible conductor may rest throughout its length, and a' receptacle containing an insulatin fluid in which the said parts are immersed and provided with circuit terminals that engage the end caps and support the tube.

5. The combination with an insulating fluid and a fusible conductor, of an inclosing device for the conductor that normally llllllltains. the insulating fluid out of contact therewith and is provided with a weakened portion-which is ruptured upon the fusing of the conductor.

In testimony whereof, we have hereunto subscribed our names this th day of October,1905.

SAMUEL M. KINTNER. GIRARD B. ROSENBLATT. Witnesses as to Samuel M. Kintner:

O'r'ro S. Sonarnnn, I .BIRNEY IIINES. v Witnesses as to Girard B. Roscnblatt:

Bnn'mann P. Rows, Bnumr HINES. 

